If one concludes that there are no natural laws in evolutionary biology, one must ask, on what can one then base biological theories? The view now widely adopted is that theories in evolutionary biology are based on concepts rather than laws, and this branch of science certainly has abundant concepts on which to base theories. Let me just mention such concepts as natural selection, struggle for existence, competition, biopopulation, adaptation, reproductive success, female choice, and male dominance. [...] As a result, a philosophy of physics based on natural laws turns out to be something very different from a philosophy of biology based on concepts.

1946 "The naturalist in Leidy's time and today". Proceedings of the Academy of Natural Sciences of Philadelphia 98:271-276

1947 "Ecological factors in speciation". Evolution 1:263-288

1948 "The new Sanford Hall". Natural History 57:248-254

1950 The role of the antennae in the mating behavior of female Drosophila. Evolution 4:149-154

1951 Introduction and Conclusion. Pages 85,255-258 in The problem of land connections across the South Atlantic with special reference to the Mesozoic. Bulletin of the American Museum of Natural History 99:79-258

1961 "Cause and effect in biology: Kinds of causes, predictability, and teleology are viewed by a practicing biologist". Science 134:1501-1506

1962 "Accident or design: The paradox of evolution". Pages 1-14 in The Evolution of Living Organisms (G W Leeper, Ed) Melbourne University Press.

1964 Introduction, Bibliography and Subject Pages vii-xxviii, 491-513 in On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, by Charles Darwin. A Facsimile of the First Edition. Harvard University Press.

1965 Comments. In Proceedings of the Boston Colloguium for the Philosophy of Science, 1962-1964. Boston Studies in the Philosophy of Science 2:151-156

1969 Discussion: Footnotes on the philosophy of biology. Philosophy of Science 36:197-202

1972 Continental drift and the history of the Australian bird fauna. Emu 72:26-28

1985. How biology differs from the physical sciences. In D. J. Depew and B H Weber, eds., Evolution at a Crossroads: The New Biology and the New Philosophy of Science, Cambridge MA: The MIT Press, pp. 43-63